I was admiring the DS1307 Real Time Clock breakout board kit. The crystal is a 32.768 KHz crystal.
Am I correct in assuming that if I swap the crystal with one of a different value, it will affect the clock speed?
What I am trying to do is make a sidereal clock, which is used in astronomy. Sidereal time runs faster than BANNED Mean Time by about 3 minutes and 56 seconds per day. Which in theory means if I swap the 32.768 KHz crystal with a 32.858 KHz crystal the DS1307 will run sidereal time.
Assuming I can find such crystals, is it that easy, or are additional electronics required?
Can I change the DS1307's crystal
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
- adafruit_support_bill
- Posts: 88096
- Joined: Sat Feb 07, 2009 10:11 am
Re: Can I change the DS1307's crystal
Interesting topic. Maxim has an app-note on crystal selection - if you could find one at that frequency.
http://www.maximintegrated.com/en/app-n ... .mvp/id/58
Here is one approach to the problem: http://www.jimbo.net/circuitfarm/2010/07/sidereal-time/
http://www.maximintegrated.com/en/app-n ... .mvp/id/58
Here is one approach to the problem: http://www.jimbo.net/circuitfarm/2010/07/sidereal-time/
- winchell chung
- Posts: 59
- Joined: Mon Sep 23, 2013 2:16 pm
Re: Can I change the DS1307's crystal
Thanks for the links!
Sidereal clocks have a very limited market, all of it astronomy related. Generally only in astronomical clocks and telescope tracking motors.
I just so happen to have a couple of specialty crystals of the correct values. Though your jumbo.net link is very interesting
Sidereal clocks have a very limited market, all of it astronomy related. Generally only in astronomical clocks and telescope tracking motors.
I just so happen to have a couple of specialty crystals of the correct values. Though your jumbo.net link is very interesting
Please be positive and constructive with your questions and comments.